[Python-checkins] r62219 - python/trunk/Doc/whatsnew/2.6.rst

[andrew.kuchling]

Author: andrew.kuchling
Date: Tue Apr  8 01:57:07 2008
New Revision: 62219

Modified:
   python/trunk/Doc/whatsnew/2.6.rst
Log:
Write PEP 3127 section; add items

Modified: python/trunk/Doc/whatsnew/2.6.rst
==============================================================================
--- python/trunk/Doc/whatsnew/2.6.rst	(original)
+++ python/trunk/Doc/whatsnew/2.6.rst	Tue Apr  8 01:57:07 2008
@@ -728,6 +728,12 @@
 Python 2.6 adds :class:`bytes` as a synonym for the :class:`str` type,
 and it also supports the ``b''`` notation.
 
+There's also a ``__future__`` import that causes all string literals
+to become Unicode strings.  This means that ``\u`` escape sequences 
+can be used to include Unicode characters.
+
+XXX give example
+
 .. seealso::
 
    :pep:`3112` - Bytes literals in Python 3000
@@ -952,22 +958,48 @@
 PEP 3127: Integer Literal Support and Syntax
 =====================================================
 
-XXX write this -- this section is currently just brief notes.
-
-Python 3.0 changes the syntax for octal integer literals, and 
-adds supports for binary integers: 0o instad of 0,
-and 0b for binary.  Python 2.6 doesn't support this, but a bin()
-builtin was added.
-
-XXX changes to the hex/oct builtins
+Python 3.0 changes the syntax for octal (base-8) integer literals,
+which are now prefixed by "0o" or "0O" instead of a leading zero, and
+adds support for binary (base-2) integer literals, signalled by a "0b"
+or "0B" prefix.
+
+Python 2.6 doesn't drop support for a leading 0 signalling 
+an octal number, but it does add support for "0o" and "0b"::
+
+    >>> 0o21, 2*8 + 1
+    (17, 17)
+    >>> 0b101111
+    47
+
+The :func:`oct` built-in still returns numbers 
+prefixed with a leading zero, and a new :func:`bin` 
+built-in returns the binary representation for a number::
+
+    >>> oct(42)
+    '052'
+    >>> bin(173)
+    '0b10101101'
+
+The :func:`int` and :func:`long` built-ins will now accept the "0o"
+and "0b" prefixes when base-8 or base-2 are requested, or when the
+**base** argument is zero (meaning the base used is determined from
+the string):
+
+    >>> int ('0o52', 0)
+    42
+    >>> int('1101', 2)
+    13
+    >>> int('0b1101', 2)
+    13
+    >>> int('0b1101', 0)
+    13
 
 
-New bin() built-in returns the binary form of a number.
-
 .. seealso::
 
    :pep:`3127` - Integer Literal Support and Syntax
-      PEP written by Patrick Maupin.
+      PEP written by Patrick Maupin; backported to 2.6 by
+      Eric Smith.
 
 .. ======================================================================
 
@@ -1124,6 +1156,13 @@
 
   .. Patch 1686487
 
+* Tuples now have an :meth:`index` method matching the list type's
+  :meth:`index` method::
+
+    >>> t = (0,1,2,3,4)
+    >>> t.index(3)
+    3
+
 * The built-in types now have improved support for extended slicing syntax,
   where various combinations of ``(start, stop, step)`` are supplied.
   Previously, the support was partial and certain corner cases wouldn't work.
@@ -1642,6 +1681,12 @@
 
   .. Patch #1393667
 
+  The :func:`post_mortem` function, used to enter debugging of a 
+  traceback, will now use the traceback returned by :func:`sys.exc_info`
+  if no traceback is supplied.   (Contributed by Facundo Batista.)
+
+  .. Patch #1106316
+
 * The :mod:`pickletools` module now has an :func:`optimize` function 
   that takes a string containing a pickle and removes some unused 
   opcodes, returning a shorter pickle that contains the same data structure.
@@ -1720,6 +1765,8 @@
 
   .. Patch 1657
 
+  .. XXX 
+
 * The :mod:`sets` module has been deprecated; it's better to 
   use the built-in :class:`set` and :class:`frozenset` types.
 
@@ -2069,6 +2116,19 @@
 
   .. Patch 1551895
 
+* Python's use of the C stdio library is now thread-safe, or at least
+  as thread-safe as the underlying library is.  A long-standing potential
+  bug occurred if one thread closed a file object while another thread 
+  was reading from or writing to the object.  In 2.6 file objects 
+  have a reference count, manipulated by the 
+  :cfunc:`PyFile_IncUseCount` and :cfunc:`PyFile_DecUseCount`
+  functions.  File objects can't be closed unless the reference count 
+  is zero.  :cfunc:`PyFile_IncUseCount` should be called while the GIL 
+  is still held, before carrying out an I/O operation using the 
+  ``FILE *`` pointer, and :cfunc:`PyFile_DecUseCount` should be called
+  immediately after the GIL is re-acquired.
+  (Contributed by Antoine Pitrou and Gregory P. Smith.)
+
 * Several functions return information about the platform's 
   floating-point support.  :cfunc:`PyFloat_GetMax` returns
   the maximum representable floating point value,
@@ -2089,6 +2149,13 @@
 
   .. Issue 1635
 
+* Many C extensions define their own little macro for adding 
+  integers and strings to the module's dictionary in the 
+  ``init*`` function.  Python 2.6 finally defines standard macros 
+  for adding values to a module, :cmacro:`PyModule_AddStringMacro`
+  and :cmacro:`PyModule_AddIntMacro()`.  (Contributed by 
+  Christian Heimes.)
+
 * Some macros were renamed in both 3.0 and 2.6 to make it clearer that
   they are macros,
   not functions.  :cmacro:`Py_Size()` became :cmacro:`Py_SIZE()`,
@@ -2140,6 +2207,13 @@
   module now support the context protocol, so they can be used 
   in :keyword:`with` statements. (Contributed by Christian Heimes.)
 
+  :mod:`_winreg` also has better support for x64 systems, 
+  exposing the :func:`DisableReflectionKey`, :func:`EnableReflectionKey`,
+  and :func:`QueryReflectionKey` functions, which enable and disable
+  registry reflection for 32-bit processes running on 64-bit systems.
+  
+  .. Patch 1753245
+
 * The new default compiler on Windows is Visual Studio 2008 (VS 9.0). The 
   build directories for Visual Studio 2003 (VS7.1) and 2005 (VS8.0)
   were moved into the PC/ directory. The new PCbuild directory supports